855773520-LEED-v5-ID-C-Reference-Guide-Launch-Edition-1 - Page 191

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For example, projects in Europe may use the current default factor from the EU directive (1.9 as of this publication [43] ), a lower published factor from the project’s EU member state, or a factor determined based on policy-based published grid renewable projections through 2050 for the EU or the project’s member state.

More granular future source energy conversion factors per state, province, or eGRID region are not allowed because these necessitate greater complexity of EAc2: Enhanced Energy Efficiency requirements and increase ambiguity in comparative results.

Fuel Use one of the following references for conversion factors:

ENERGY STAR® Portfolio Manager Technical Reference: Source Energy [44] Natural gas source energy conversion factor = 1.09 per ASHRAE 90.1-2022, Table I5-1.

• ASHRAE 100-2024 [45] Table 5-2 or ASHRAE 228 [46] Table 4.

• Published national or EU-average source energy conversion factor conforming to the definition of source energy provided above.

District energy systems (DES) For projects that directly model purchased heat and/or purchased CHW as independent sources, refer to EAp2: Minimum Energy Efficiency, DES, Method B.

Source energy factors published by the DES provider or calculated for a campus DES system must conform to the definition of source energy provided above.

Future Source Energy Only Acceptable Metric for EAc2: Enhanced Energy Efficiency

The future source energy metric prioritizes energy efficiency, limiting “trade-offs” with decarbonization measures recognized in other LEED credits. Other metrics used for code compliance or EAp2: Minimum Energy Efficiency are not applicable for EAc2: Enhanced Energy Efficiency:

43 “Directive (EU) 2023/1791 of the European Parliament and of the Council of 13 September 2023 on energy efficiency and amending Regulation (EU) 2023/955”, European Parliament, Council of the European Union, June 13, 2024, https://eur[lex.europa.eu/eli/dir/2023/1791/.](https://eur-lex.europa.eu/eli/dir/2023/1791/) 44 “ENERGY STAR® Portfolio Manager Technical Reference: Source Energy”, ENERGY STAR®, accessed March 31, 2025, https://www.energystar.gov/buildings/tools-and-resources/portfolio-manager-technical-reference-source-energy. 45 “ASHRAE 100-2024”, ASHRAE, accessed March 31, 2025, https://webstore.ansi.org/standards/ashrae/ansiashraeiesstandard1002024?srsltid=AfmBOoooV3zeh4CHWn8HWU7alLQbx6KJcwyN28B1uQaa-fa4tdweiwc. 46 “ASHRAE 228”, ASHRAE, accessed March 31, 2025, https://store.accuristech.com/ashrae/standards/ashrae-2282023?product_id=2562375.

U.S. Green Building Council LEED v5 Reference Guide for Interior Design and Construction, April 2025 Launch Edition 180